Grieving parents took the stage at both the Republican and Democratic conventions to criticize the opposing party's nominee, but only one of those speeches got sustained media attention.

Since his now-famous rebuke of GOP nominee Donald Trump at the DNC on Thursday, Khizr Kahn, often accompanied by his wife, has appeared for interviews at least twice on CNN, at least twice on MSNBC, on ABC's "This Week," on NBC's "Today," and on NBC's "Meet the Press." Khan's son died in 2004 in Iraq, and Khan has criticized Trump as someone who hasn't sacrificed anything for America.

In contrast, the mother of one of the Americans killed in the 2012 Benghazi attack, Patricia Smith, spoke at the Republican convention and has only appeared for one national TV interview. It was on Fox News' "Hannity" during the Republican convention two weeks ago, when she criticized Hillary Clinton for failing to take steps to secure and save her son.

Smith has appeared on other programs in recent years, but the discrepancy between her media interviews and Khan's since the convention as the general election heats up has been pronounced.

Some media observers have said Trump himself has been keeping the Khans in the news cycle by responding to the speech, both on Twitter and in an interview Sunday on ABC's "Meet the Press."

In that interview, Trump suggested that Khan's wife, Ghazala, stood by silently during her husband's speech at the DNC, perhaps because she is a Muslim and was not permitted by her husband to speak. Trump also said Khan was "very emotional" in the speech, "looked like a nice guy" and that he wished him "the best of luck."

Trump's response has since been cast in news reports as an "attack" on the Khans, to which he said Sunday on Twitter, "I was viciously attacked by Mr. Khan at the Democratic Convention. Am I not allowed to respond?"

Clinton responded to Patricia Smith's RNC speech, in which Smith said she blamed Clinton "personally" for the death of her son in Benghazi. But that incident received minimal coverage in the press.

In an interview on Fox News, Clinton said, "You know, look, I feel a great deal of sympathy for the families of the four brave Americans that we lost at Benghazi. And I certainly can't even imagine the grief that she has for losing her son. But she's wrong. She's absolutely wrong."

An email blast from the Clinton campaign also criticized Smith's speech.

"One woman wanted to see Hillary in prison stripes," said the email, which was sent out hours after the speech. "Later in the evening, the crowd chanted, 'Lock her up!' as the onstage speaker happily cheered them on. This isn't normal political behavior."